An event recorder for a power supply and a method thereof are provided. The event recorder method includes: selecting an event combination; based on the selected event combination, performing a setting step to set a trigger source combination and a record data combination, wherein the setting step further comprises any combination of the following: setting a record data type combination, setting a trigger type combination, setting a resolution combination, and setting a logic combination; and in response to a logic combination result of the trigger source combination, storing the record data combination in a storage unit.